Graphene/polypyrrole intercalating nanocomposites as supercapacitors electrode
Graphene/polypyrrole intercalating nanocomposites as supercapacitors electrode
复制标题
DOI：
10.1016/j.electacta.2013.08.149
复制
发表时间：
2013-12-01
影响因子：
6.6
通讯作者：
Tang, Weihua
中科院分区：
文献类型：
--
作者：
Liu, Yun;Wang, Huanhuan;Tang, Weihua
采用原位插层化学聚合法制备了聚吡咯（PPy）插层石墨烯片层。所制备的石墨烯/聚吡咯纳米复合材料已成功地在组成，形貌和电化学性能方面进行了表征。结果发现，化学修饰的石墨烯纳米片和原位聚合的PPy层形成均匀的纳米复合材料，其中均匀的PPy层插层在石墨烯基底之间。这种均匀的纳米结构与所观察到的高电导率（最高1980 Sm（-1））一起提供了石墨烯/PPy复合材料，当用作超级电容器电极时，在充放电过程中具有高的比电容和良好的循环稳定性。石墨烯/PPy（具有优化的组成10：1）基超级电容器显示出令人感兴趣的性能，在0.45 A g（-1）电流密度下具有650 F g（-1）的最大比电容，在1 mA电流下具有54.0 W h kg（-1）的最高能量密度，并且在5 mA电流下具有778.1 W kg（-1）的最高功率密度。此外，石墨烯/PPy超级电容器表现出优异的循环稳定性，在5000次循环后保持95%的比电容。本文的研究结果为石墨烯/聚吡咯复合材料在高能量密度储能系统中的应用开辟了一扇新的窗口。(C)2013爱思唯尔有限公司保留所有权利。
Hierarchical plush polypyrrole (PPy) layers intercalated graphene sheets have been prepared by in-situ intercalative chemical polymerization. The as-prepared graphene/PPy nanocomposites have been successfully characterized in terms of composition, morphology, and electrochemical properties. It was found that the chemically modified graphene nanosheets and in-situ polymerized PPy layers formed uniform nanocomposites with homogeneous PPy layers intercalated between the graphene substrates. Such uniform nanostructure together with the observed high conductivities (the highest 1980 S m(-1)) afforded the graphene/PPy composites with high specific capacitance and good cycling stability during the charge-discharge process when used as supercapacitor electrodes. The graphene/PPy (with optimized composition 10:1) based supercapacitors display intriguing performance with a maximum specific capacitance of 650 F g(-1) at 0.45 A g(-1) current density, a highest energy density of 54.0 W h kg(-1) at 1 mA current, and a highest power density of 778.1 W kg(-1) at 5 mA current. Furthermore, the graphene/PPy supercapacitor exhibits an excellent cycling stability with 95% specific capacitance retained after 5000 cycles. The impressive results presented here may open the window for grapheme/PPy composites for their promising applications in high energy density storage system. (C) 2013 Elsevier Ltd. All rights reserved.